[RFC,v2,5/9] cpu: Abstract CPU core type

Add an abstract CPU core type that could be used by machines that want
to define and hotplug CPUs in core granularity.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
---
 hw/cpu/Makefile.objs  |  1 +
 hw/cpu/core.c         | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++
 include/hw/cpu/core.h | 31 ++++++++++++++++++
 3 files changed, 119 insertions(+)
 create mode 100644 hw/cpu/core.c
 create mode 100644 include/hw/cpu/core.h

On Fri, Mar 11, 2016 at 10:24:34AM +0530, Bharata B Rao wrote:
> Add an abstract CPU core type that could be used by machines that want
> to define and hotplug CPUs in core granularity.
> 
> Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  hw/cpu/Makefile.objs  |  1 +
>  hw/cpu/core.c         | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/hw/cpu/core.h | 31 ++++++++++++++++++
>  3 files changed, 119 insertions(+)
>  create mode 100644 hw/cpu/core.c
>  create mode 100644 include/hw/cpu/core.h
> 
> diff --git a/hw/cpu/Makefile.objs b/hw/cpu/Makefile.objs
> index 0954a18..942a4bb 100644
> --- a/hw/cpu/Makefile.objs
> +++ b/hw/cpu/Makefile.objs
> @@ -2,4 +2,5 @@ obj-$(CONFIG_ARM11MPCORE) += arm11mpcore.o
>  obj-$(CONFIG_REALVIEW) += realview_mpcore.o
>  obj-$(CONFIG_A9MPCORE) += a9mpcore.o
>  obj-$(CONFIG_A15MPCORE) += a15mpcore.o
> +obj-y += core.o
>  
> diff --git a/hw/cpu/core.c b/hw/cpu/core.c
> new file mode 100644
> index 0000000..3faf53d
> --- /dev/null
> +++ b/hw/cpu/core.c
> @@ -0,0 +1,87 @@
> +/*
> + * CPU core abstract device
> + *
> + * Copyright (C) 2016 Bharata B Rao <bharata@linux.vnet.ibm.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + */
> +#include "hw/cpu/core.h"
> +#include "qapi/visitor.h"
> +#include "sysemu/cpus.h"
> +
> +static void core_prop_get_core(Object *obj, Visitor *v, const char *name,
> +                               void *opaque, Error **errp)
> +{
> +    CPUCore *core = CPU_CORE(obj);
> +    int64_t value = core->core;
> +
> +    visit_type_int(v, name, &value, errp);
> +}
> +
> +static void core_prop_set_core(Object *obj, Visitor *v, const char *name,
> +                               void *opaque, Error **errp)
> +{
> +    CPUCore *core = CPU_CORE(obj);
> +    Error *local_err = NULL;
> +    int64_t value;
> +
> +    visit_type_int(v, name, &value, &local_err);
> +    if (local_err) {
> +        error_propagate(errp, local_err);
> +        return;
> +    }
> +
> +    core->core = value;
> +}
> +
> +static void core_prop_get_threads(Object *obj, Visitor *v, const char *name,
> +                                  void *opaque, Error **errp)
> +{
> +    CPUCore *core = CPU_CORE(obj);
> +    int64_t value = core->threads;
> +
> +    visit_type_int(v, name, &value, errp);
> +}
> +
> +static void core_prop_set_threads(Object *obj, Visitor *v, const char *name,
> +                                  void *opaque, Error **errp)
> +{
> +    CPUCore *core = CPU_CORE(obj);
> +    Error *local_err = NULL;
> +    int64_t value;
> +
> +    visit_type_int(v, name, &value, &local_err);
> +    if (local_err) {
> +        error_propagate(errp, local_err);
> +        return;
> +    }
> +
> +    core->threads = value;
> +}
> +
> +static void cpu_core_instance_init(Object *obj)
> +{
> +    CPUCore *core = CPU_CORE(obj);
> +
> +    object_property_add(obj, "core", "int", core_prop_get_core,
> +                        core_prop_set_core, NULL, NULL, NULL);
> +    object_property_add(obj, "threads", "int", core_prop_get_threads,
> +                        core_prop_set_threads, NULL, NULL, NULL);
> +    core->threads = smp_threads;
> +}
> +
> +static const TypeInfo cpu_core_type_info = {
> +    .name = TYPE_CPU_CORE,
> +    .parent = TYPE_DEVICE,
> +    .abstract = true,
> +    .instance_size = sizeof(CPUCore),
> +    .instance_init = cpu_core_instance_init,
> +};
> +
> +static void cpu_core_register_types(void)
> +{
> +    type_register_static(&cpu_core_type_info);
> +}
> +
> +type_init(cpu_core_register_types)
> diff --git a/include/hw/cpu/core.h b/include/hw/cpu/core.h
> new file mode 100644
> index 0000000..a2a5a04
> --- /dev/null
> +++ b/include/hw/cpu/core.h
> @@ -0,0 +1,31 @@
> +/*
> + * CPU core abstract device
> + *
> + * Copyright (C) 2016 Bharata B Rao <bharata@linux.vnet.ibm.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + */
> +#ifndef HW_CPU_CORE_H
> +#define HW_CPU_CORE_H
> +
> +#include "qemu/osdep.h"
> +#include "hw/qdev.h"
> +
> +#define TYPE_CPU_CORE "cpu-core"
> +
> +#define CPU_CORE(obj) \
> +    OBJECT_CHECK(CPUCore, (obj), TYPE_CPU_CORE)
> +
> +typedef struct CPUCore {
> +    /*< private >*/
> +    DeviceState parent_obj;
> +
> +    /*< public >*/
> +    int core;
> +    int threads;
> +} CPUCore;
> +
> +#define CPU_CORE_PROP_CORE "core"
> +
> +#endif